ERA5 almanac comparison — 8 years of real data
Aruba vs Sea Island: weather in May
Essentially a tie in May: Aruba is 39% clear historically, Sea Island is 36% clear (8-year ERA5 average) — within the noise. Avg high 87°F vs 81°F. Sea Island also sees measurably more rain than Aruba this month (36% vs 18% of days). Pick based on flight time or price, not weather — the weather won't decide this one for you.
Aruba
AW
- Clear days, May
- 39%
- Sample size
- n=248 days
- Avg high
- 87°F
- Early May (1st–15th)
- 34%
- Late May (16th–end)
- 43%
- Rain frequency
- 18% of days
Sea Island
GA
- Clear days, May
- 36%
- Sample size
- n=248 days
- Avg high
- 81°F
- Early May (1st–15th)
- 41%
- Late May (16th–end)
- 31%
- Rain frequency
- 36% of days
Compare Aruba vs Sea Island in another month
All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.